Review

Back to school! Today in math class we are reviewing for the STAAR test (major test) which will be in like 52 days. We are reviewing on making slope intercept equations by looking at a graph with the lines on it (sorry if that's to vague). Then he gave us a pop quiz! On the day back to school! Which was just to see if we remembered what we learned before break! Which I passed! Which means I can relax right?! No. Mr. S gave us a pretty good speech on how everything counts this semester. From now on, there won't be anymore taking it easy and if you do, it's going to bite back, HARD.

Systems of Inequalities 2

Today in class we reviewed about systems of inequalities. We basically did a few problems and did more complicated ones when we got it down. All we have to do is afford not to make mistakes. In problems like these, one simple mistake like forgetting the negative or calculating wrong will not only give you the wrong answer, but cost you a lot of wasted time doing the problem wrong and doing the problem all over again. So now this is the time to be a perfectionist and let nothing distract you from making it perfect. 

Systems of Inequalities

Today in math class we learned about systems if inequalities. Well, more like a review now since we were on Thanksgiving Break and all. Mr. S gave us 7 steps for substitution. 1) pick variable. 2) Solve for variable. 3) Substitute. 4) CLT. 5) Solve. 6) Sub. into original equation 7) Solve. Technically he put 4 steps but I wanted to be very specific and put three extra steps. Now, the moment you've been waiting for...an example!


EX: 2x + 4y = 10
      x + y = 7  isolate your x! --> x = 7 - y
      2(7 - y) + 4y = 10
      14 - 2y + 4y = 10
      14 + 2y = 10
      2y = -4
      y = -2


Then to find your "x" you would put in substitute the "y" into the original equation.


EX: x = (-2) - 7
      x = 9


Then your coordinates are (9,-2). Simple, easy, and quick to do! Just don't mess up on your negatives...the process must be PERFECT!!!

Scatter Plots & Trendlines

Today in math class we learned about scatter plots and trend lines. Trend lines are a line of best fit and scatter plots are just plots scattered on a plane. We also learned that if a graph has two lines that are going up from left to right and are parallel, then it has a correlation. If there is a graph that just has plots scattered then it has no correlation.

Inequalities

Today in math class we learned about inequalities. But first we reviewed on changing point slope form to standard form. For inequalities, we learned that < means less than (we already knew that, but I can't say that for some of my fellow classmates) and > means greater than. Also that < means less than or equal to and > means greater than or equal to. We also learned how to graph them. For example: 2x + 4 < 10. You would subtract four from the problem so it would end up like: 2x < 6. Then you would divide by two to both sides and it would end up like: x < 3. When we graph it, you would put an open circle on 3 and draw a solid line going left on a number line.

Standard Form

Today in math class we continued learning on standard form. I've learned that when a slope is positive the coefficient is negative and vise versa. For example: y = 2/3x + 2 ---> 2x - 3y = -6. I think I've finally got a hang of standard form! Wow, big moment for me. I just love those moments when I get the lightbulb. It's just an awesome feeling to get!

Substitute & Equations

Today in math class we continued learning about slopes and graphs. Today Mr. S gave us a worksheet. We had to graph the equation given to us on the worksheet and tell if it is steep, if "y" decreases or increases, give the y-intercept, and tell if the slope goes up fromm left to right. The worksheet was basically very easy to understand after Mr. S went over some of the columns like telling if the "y" increases or decreases. We finished the worksheet in class and if we didn't finish it in class then we would have to finish it for homework. We also learned that if we substituted the coordinates in the equation: y = 3x + 1; (2,7) then we would know if the coordinates were right or not. For example, if we substited 2 for "x" in the equation and 7 for "y" then the equation would be true because 7 = 3(2) + 1 is a true statement. If the coordinates you substituted in aren't true then you would know that the coordinates are wrong.